astrophysicshttp://www.aavso.org/taxonomy/term/73/all
enExoplanets and the Search for Extraterrestrial Lifehttp://www.aavso.org/exoplanets-and-search-extraterrestrial-life
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<span style="font-size:16px;"><strong><span style="font-family: arial, helvetica, sans-serif; ">&nbsp;Variable Stars and the Stories They Tell: &nbsp;</span></strong></span></p>
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<span style="font-size:16px;"><strong><span style="font-family: arial, helvetica, sans-serif; ">Exoplanets and the Search for Extraterrestrial Life</span></strong></span></p>
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<span style="font-size:14px;"><span style="font-family: arial, helvetica, sans-serif; ">by Dale Bryant &nbsp;&nbsp;</span></span></p><p><a href="http://www.aavso.org/exoplanets-and-search-extraterrestrial-life" target="_blank">read more</a></p>aliensastronomyastrophysicseducationETexoplanetsphotometryphysicssciencevariable starsTue, 04 Sep 2012 16:20:46 +0000SXN797 at http://www.aavso.orgTT Ari continues its curious activityhttp://www.aavso.org/tt-ari-continues-its-curious-activity
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Observations of TT Ari seem to be showing a partial recovery from its deep minimum of 2008-2009, but this star still hasn&#39;t quite reached its normal high state yet.&nbsp; Researchers also still haven&#39;t figured out <em>why</em> it&#39;s doing what it&#39;s doing, but your observations are going to help solve the puzzle.</p>
<p><a href="http://www.aavso.org/tt-ari-continues-its-curious-activity" target="_blank">read more</a></p>astrophysicscataclysmic variablesnovaenovalike variablesobservationsobserving campaignphotometryvariable starsvisual observationsThu, 21 Oct 2010 22:06:36 +0000Matthew Templeton1997 at http://www.aavso.orgRR Lyraehttp://www.aavso.org/vsots_rrlyr
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<img alt="" src="/sites/default/files/images/rrlyr_1deg_dssIblue.jpg" style="width: 175px; height: 175px;" /><br />
<em>RR Lyrae, 1 degree field, DSS I survey plate<br />
(copyright 1993-1995 CalTech/STScI)</em></p><p><a href="http://www.aavso.org/vsots_rrlyr" target="_blank">read more</a></p>astronomyastrophysicseducationfront page newsobservingvariable starvsotsWed, 22 Sep 2010 18:16:44 +0000Matthew Templeton1799 at http://www.aavso.orgThe Cosmic Distance Ladderhttp://www.aavso.org/cosmic-distance-ladder
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<a href="http://imagine.gsfc.nasa.gov/YBA/HTCas-size/parallax1-more.html"><img alt="" src="/sites/default/files/images/parallax_diagram_nasa_imagine.gif" style="width: 200px; height: 242px; margin: 2px; float: right;" /></a>Distances in the universe are so vast that we do not have a simple way of measuring them.&nbsp; For distances within the solar system we can measure them directly, using <em>radar</em> for example, and some very straightforward trigonometry.&nbsp; But radar is hard to use when it takes light minutes or hours to cross the solar system; and the nearest star is four ligh<p><a href="http://www.aavso.org/cosmic-distance-ladder" target="_blank">read more</a></p>astronomyastrophysicsCepheid variablescosmic distance laddereducationphysicsredshiftsciencevariable starsThu, 06 May 2010 18:07:01 +0000Matthew Templeton793 at http://www.aavso.orgStellar Evolutionhttp://www.aavso.org/stellar-evolution
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Variable stars highlight an important fact about the heavens above us: the universe is always changing. &nbsp;The universe is very large, stars and galaxies are very far away, and many changes occur on timescales far longer than we can see. &nbsp;Most things in the sky -- stars, nebulae, and galaxies -- don&#39;t appear to change at all during the course of a human lifetime.<p><a href="http://www.aavso.org/stellar-evolution" target="_blank">read more</a></p>astronomyastrophysicseducationphysicssciencevariable starsThu, 06 May 2010 18:02:12 +0000Matthew Templeton789 at http://www.aavso.orgGamma Ray Burstshttp://www.aavso.org/gamma-ray-bursts
<h2>What is a Gamma Ray Burst?</h2>
<p>A gamma-ray burst (GRB) is a brief flash of gamma rays coming from an astrophysical source at great distances from us, often from hundreds of millions of light years away. Gamma rays are a kind of light (like visible light, microwaves, or X-rays) that is very energetic, and whatever produces gamma rays must therefore contain (and unleash) a large amount of energy in a very short amount of time. Thus the study of gamma ray bursts is a study of some of the most violent events in the universe.</p><p><a href="http://www.aavso.org/gamma-ray-bursts" target="_blank">read more</a></p>astrophysicseducationgamma rayGRBHENHigh Energy NetworkWed, 17 Mar 2010 19:10:56 +0000Matthew Templeton85 at http://www.aavso.org